The most common sequelae after thyroid tumor surgery, also called complications, mainly include the following aspects: 1. Postoperative bleeding: the causes of postoperative bleeding of thyroid gland are mostly related to the incomplete ligation of blood vessels during the surgery. Because nowadays it is a hot weapon operation, sometimes the dislodgement of coagulated tissues may cause bleeding, and the bleeding pools into the surgical cavity to stimulate the trachea and cause local compression symptoms, and the patient will feel tightness in the chest, dyspnea, or even asphyxia, which is very dangerous, and it should be detected and treated in time. 2. Voice change: If the voice is hoarse after the thyroid tumor surgery, it suggests that the laryngeal recurrent nerve or supraglottic laryngeal nerve is damaged during the surgery. Depending on whether the nerve was touched or cut off at that time, the recovery time is not the same; 3. Hypothyroidism: too much thyroid tissue is removed or after total thyroidectomy, thyroid preparations need to be taken for the whole life; 4. Impact on the parathyroid function: the problem of low calcium occurs.